Had a bit of a chat on e-mail with Dave today, I think we were both supposed to be hard at work not talking bass! he's going to hopefully be installing and wiring up the pick-ups at the weekend, he's came up with an alternative to my idea but using the same concept, each rotary pick-up switch will now be:
1.Off
2.Both Coils Parallel
3.Both Coils Series
4. Single coil
We also talked about knobs but I'll keep that conversation private for now